Changing reflection size?

How do I change the reflection of the poster views?
For me personally the reflection is too much.
Is it simply adjusting the height of the image and adjusting the viewtype xml file where I give the same height as the reflection image itself?

This has been covered in a couple threads and has nothing to do with this topic.
Familiarize yourself with colors/defaults.xml (assuming you're using the white theme).
The whole thing is labeled and fairly self-explanatory.